Converts an 8-bit format image to a 16Q12 format image.


func vImageConvert_8to16Q12(_ src: UnsafePointer<vImage_Buffer>, _ dest: UnsafePointer<vImage_Buffer>, _ flags: vImage_Flags) -> vImage_Error



A pointer to a vImage buffer structure that contains the source image whose data you want to convert.


A pointer to a vImage buffer data structure. You're responsible for filling out the height, width, and rowBytes fields of this structure, and for allocating a data buffer of the appropriate size. On return, the data buffer this structure points to contains the destination image data. When you no longer need the data buffer, you must deallocate the memory.


The options to use when performing the operation. If you plan to perform your own tiling or use multithreading, pass kvImageDoNotTile.

Return Value

kvImageNoError; otherwise, one of the error codes described in Data Types and Constants.


The conversion from 8-bit float to 16-bit format with 12 fractional bits is:

uint16_t dest = ((src << 12) + 127)/255;

Source pixel values of 0 are mapped to 0, and source pixel values of 255 are mapped to 0x1000 (4096). No larger values are produced by this conversion, which provides some headroom to help subsequent operations avoid overflow or clipping.

This routine doesn't work in place.